Air or gas exhausting pump.



n sao,| a4. Patented Ang s, l90l.

M. TOUPIKOF &. G. K. GRAHAM.

MB 08 GAS EXHAUSTING PUMP.

(Apfliczation filed Dec. 8, 1900.)

m: "cams Parana ca. PHOTO-LITHO-. \VASHFNOTGN. n. c.

UNITED STATES PATENT FFICE.

MICHEL TOUPIKOF, OF ST. PETERSBURG, AND CHARLES K. GRAHAM, on ZAVOD, RUSSIA.

AIR OR GAS EXHAUSTING PUMP.

SPEGIFIGATION forming part of Letters Patent No. 680,184, dated August e, 1901.

Application filed December 8; 1900. Serial No. 39,222. (No model.)

To (tZZ whont it mcty concern:

Be it known that we, MICHEL TOUPIKOF, a citizen of Russia, residing at 8 Litenie Prospect, St. Petersburg, and CHARLES KNOTT GRAHAM, a citizen of England, residing at Zavod, Uralite, Bolchaya, Oxta, Russia, have invented certain new and useful Improvements in Air or Gas Exhausting Pumps, (for which we have applied fora patent in Great Britain,dated May 7 ,1900, No. 8,408,) of which the following is a specification.

In ordinary pumps employed for exhausting air or gas there is some clearance-space left beyond the piston at the end of its stroke, and the presence of air in this space renders it impossible to exhaust beyond a certain degree of vacuum.

Our invention relates to a construction and arrangement of the piston, the pump-bottom, and the valves in such a manner as to provide against any such clearance-space, and therefore to be able to obtain a perfect vacuum. For this purpose we construct the piston and lower part of the pump, with its valves, as we shall describe with reference to the accompanying drawing, which is a vertical section of these parts, with the loaded sue tion-valve lever shownin elevation.

a is a pump-cylinder, fitted with a piston b,

the under side of which has the form of a hollow cone having its sides inclined, preferably, but not necessarily, at about forty-five degrees to the vertical.

0 is the discharge-valve, which is seated in the center of the piston under a projecting part which carries a perforated guide at for the valve-stem. Several sloping passages 6 lead down to the valve 0. The cylinder-bottomf is detachably connected to the cylinder,

made conical to fit the hollow of the piston,

the vessel from which air or gas has to be exhausted.

The loaded lever is employed, so that the valve Q will securely close the opening m and a perfect vacuum be obtained. If the valve 9 is self-acting that is, if the rising thereof should depend upon-the presence of pressure in the vessel that is to be exhausted to raise it-a perfect vacuum could not be obtained unless the valve weighed less than nothing, and even if such a valve were possible it would not shut without a spring, which would be as equally disastrous. Consequently the loaded lever j is employed to securely seat the Valve. I

The pump is worked as follows: The piston when quite down is covered with oil, and then as the piston begins to be raised the valve g' is raised either by hand or it might be by suitable connections to the mechanism which works the piston. Air is drawn into the space below the piston, some of the oil passing the piston into this space. When the piston descends, the air from below it passes away by the valve 6, the valve g being quite closed by the load and pressure upon it. When the piston is at the lower end of its stroke, the oil that passes it in its upstroke occupies any clearance-space below it, all the air being expelled, as well as any surplus of the oil.

The valves 0 and g are preferably so placed that when the piston is quite down the valve 0 is slightly raised by the apex of g. The piston requires no packing, being made simply a good sliding fit to the cylinder, the oil serving for preventing air from passing the piston as it ascends.

Having thus described the nature of this invention and the best means we know for carrying the same into practical effect, we claim An air or gas exhausting pump, consisting of a cylinder, a removable bottom therefor provided on its upper face with a cone-shaped portion extending within said cylinder, said bottom further provided with a vertical passage extending therethrough at the center thereof and further provided with a horizon tally-extending passage communicating with said vertical passage, means for connecting said bottom to said cylinder, a piston operating in said cylinder and having its lower face made to conform to the shape of the conical-shaped portion of the bottom, said piston formed with sloping passages adapted to communicate with the vertical passage in the bottom of said cylinder, a discharge-valve carried by said piston -and adapted to open and close the sloping passages therein, a Valve stem extending through said vertical passage in said bottom, a suction-valve secured to the upper end of said stem and engaging said discharge-valve, a weighted lever pivotally connected with the said bottom, a head carried by said lever and suitably connected to the lower end of said stern, and a flexible tube connected to said head and with said bottom.

In testimony whereof we have hereunto set our hands in presence of two subscribing Wit 1165865. MICHEL TOUPIKOF.

CHARLES K. GRAHAM; W'itnesses:

RICHARD RE'xoU'TT, CHRISTIAN HAYES. 

